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Polythiophene-ß-Naphtholsulphonic acid: New and effective corrosion inhibitor for carbon steel in acid solution

Author Affiliations

  • 1Department of Chemistry, Kings College of Engineering, Pudukkottai- 613 303, INDIA
  • 2 PG and Research Department of Chemistry, Periyar E.V.R. College (Autonomous), Tiruchirappalli- 620 023, INDIA
  • 3 Centre for Nanoscience and Technology, Pondicherry University, Puducherry- 605 014, INDIA

Res.J.chem.sci., Volume 2, Issue (10), Pages 87-94, October,18 (2012)

Abstract

New and effective polymeric inhibitor polythiophene-β-naphtholsulphonic acid (PTh-β-NSA) was prepared and used as corrosion inhibitors for carbon steel in 1N HCl solution using chemical and electrochemical methods. Results obtained from weight loss and gasometric methods were in good agreement with electrochemical methods. Potentiodynamic polarization measurements show that PTh-β-NSA was a mixed type inhibitor. The effect of temperatures on the corrosion behavior of carbon steel was studied in the temperature ranging from 30*C to 90*C for 1N HCl at an optimum concentration of 700 ppm. The adsorption behavior of this polymer on carbon steel in 1N HCl was found to obey Langmuir adsorption isotherm. The effect of decrease in the hydrogen permeation current through the carbon steel surface was studied by the hydrogen permeation technique. The protective film formed on carbon steel by the adsorption of PTh-β-NSA was confirmed by SEM studies.

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